Letting people hide behind catch-all words like this allows them to be intellectually lazy. I prefer to challenge people to actually be clear about what they are asking me and what stances they will rally behind.

That is the impression I also got. "Intellectually lazy" - exactly. No explanation, just the 'lazy' statement: sexual non-monogamy is not commitment. When I ask why, or blink in confusion? It just is.
Again, the conclusion of this is to simply ask them to clarify. Be less lazy.